#!/usr/bin/env python3

"""Print the room's UI scale, clamped, as one number.

There is one scale in a classroom and this is where everything asks for
it: the Plasma session applies it to the display, and the browser and
Wonder Ink are told it explicitly because Chrome was measured not to
follow the compositor on its own. A shell script can read device.conf in
one line, but then there are four places that clamp, default and parse a
setting differently — which is how a room ends up with a panel at one
size and a browser at another.
"""

import os
import sys

sys.path.insert(0, "/usr/local/lib/ekklesia-classroom")
sys.path.insert(
    0,
    os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "lib"),
)

from classroom_config import read_device_config, ui_scale  # noqa: E402


def main():
    scale = ui_scale(read_device_config())

    # 2 rather than 2.0: Chrome takes either, and a whole number is what a
    # person reads in a journal line without wondering what it means.
    if scale == int(scale):
        print(int(scale))
    else:
        print(f"{scale:g}")

    return 0


if __name__ == "__main__":
    sys.exit(main())